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Rin Hoshizora is a 15-year-old, first-year high school student and an energetic girl who's fond of sports. She would rather move her body than worry about things. She ends up participating in everything just because they sound interesting. Most likely due to her involvement in sports, she is very helpful and often looks after her childhood friend, Hanayo. Her responses are always full of energy and she puts her all into practices.

Rin has been friends with Hanayo Koizumi since they were children. She likes to play sports and she often used to dress like a boy. When she was still a child, she was often teased because of this fact, so she was not used to wearing skirts.

Rin appears to be a tomboy due to playing sports and not wearing a skirt when she was a child. She mostly teases Hanayo Koizumi and appears to be with her most of the time. Her personality is similar to Honoka Kousaka's because they're both determined and hard-working. She also usually ends her sentences with nyan~! (Japanese onomatopoeia for a cat meowing) and is often depicted in cat costumes.